I have watched YouTube mechanics for Ford edge AWD take for filling the TPU with oil.

Simple fix drain and get the Duralast 88-124 extraction and filling pump. The unit has two tubes. The big tube inserts to connect to the plunger. The rubber connector that connects to the 2nd tube fits perfectly into the opening of the fill/leveling hole on the side of the unit. It took 3 minutes to fill!
No leaks! Just add what you think, close it off and drive around a little bit and comeback, unscrew the leveling plus and let the fluid out till it has stopped dripping.
Or it is easy to add, dump, add, dump and closest way of complete flush!!! Hope this can help you! Was very nice not having to take so long to fill up.
Change every 10,000 to 15,000 miles to avoid the overheating issues!